Complexity, understood as the emergence of new macro properties from the interactions of basic components, is a pervasive characteristic in natural, artificial and social systems. The Conference on Complex Systems (CCS) is the biggest and most important annual meeting of the international complex systems community. It comes under the auspices of the Complex Systems Society. This edition, after successful events in Singapore , Thessaloniki (Greece) , Cancun (Mexico) and Amsterdam (Netherlands), will take place in the Mediterranean island of Mallorca, Spain, organized by IFISC (CSIC-UIB).